A user can be in more than one group.
Only people in the same group will be shown on the "main" page.
User can use dropdown list to switch between different groups that she belongs to.
Suggest to create a "group" table to keep track of "group id", "user id".
A user can be in more than one group. Only people in the same group will be shown on the "main" page. User can use dropdown list to switch between different groups that she belongs to. Suggest to create a "group" table to keep track of "group id", "user id".